حمید زراعتگر
استادیار، دانشگاه صنعتی امیرکبیر، دانشکده مهندسی دریا و صنایع دریایی
[ 1 ] - تحلیل رفتار دینامیکی کشتی صدمه دیده در موج
آسیبدیدگی کشتیها ممکن است باعث آبگرفتگی بخشهایی از کشتی و یا حتی ازدسترفتن تعادل آن شود آسیبدیدگی کشتیها اجتنابناپذیراست. از زمانی که کشتی دچار صدمه میشود تا هنگامی که بخشهای صدمهدیده به طور کامل از آب پر شوند، رفتار کشتی تغییر مینماید. از طرف دیگر به طور معمول در شرایط محیطی سخت (وجود امواج دریا) آسیبدیدگی رخ میدهد، بنابراین لازم است تحلیل رفتار شناور در وضعیت صدمهدیده در موج انج...
[ 2 ] - استفاده از روش جداسازی متغیرها برای مطالعه موج شکن شناور
In this article, a rectangular cross section breakwater in water of finite depth and infinite domain is studied using the separation of the variables method in regular, sinusoidal waves. Determining the radiation potentials in three degrees of freedom e.g. sway, heave and roll, added mass and damping coefficients of sway, heave and roll motions is obtained. Diffraction problem is solved accordi...
[ 3 ] - مطالعه پارامتری توزیع فشار بر روی گوه به هنگام ورود به آب به روش تست مدل
Analysis of wedge water entry as a basic problem has wide application. Model testing is a powerful means to deal with the said problem. In this study, a set of water entry tests on wedges of 20, 30 and 40 degrees deadrise angles has been conducted and the pressure distributions are recorded. Free falling method in symmetry conditions are considered in this research. A parametric study on pressu...
[ 4 ] - تدوین اصول و مدل ریاضی اندازه گیری حرکات ششگانه شناور پروازی در دریا
Seakeeping recording of a vessel, so called seakeeping trial, is an important issue which is performed for some vessels. The goal of this research is to develop principles of seakeeping trial of planing vessel in sea waves. For this purpose it is initiated with the principles of ship seakeeping in sea trial. The main feature of a planing vessel is dynamic trim, high slamming accelerations and i...
[ 5 ] - Numerical Evaluation of Cushioning Pressure in Water Entry of Rigid Bodies
Effect of air cushion layer right before impact of a rigid body onto water surface has been investigated in this paper. The study is mainly focused on evaluation of cushioning pressure and the resulting free surface elevation. The air flow is assumed to be an irrotational flow which is governed by Laplace equation. The air problem and the resulting response of the water free surface are suppose...
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